tmpfs_vnops.c revision 269283
1/* $NetBSD: tmpfs_vnops.c,v 1.39 2007/07/23 15:41:01 jmmv Exp $ */ 2 3/*- 4 * Copyright (c) 2005, 2006 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Julio M. Merino Vidal, developed as part of Google's Summer of Code 9 * 2005 program. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 22 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 23 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 24 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 30 * POSSIBILITY OF SUCH DAMAGE. 31 */ 32 33/* 34 * tmpfs vnode interface. 35 */ 36#include <sys/cdefs.h> 37__FBSDID("$FreeBSD: stable/10/sys/fs/tmpfs/tmpfs_vnops.c 269283 2014-07-30 03:56:17Z kib $"); 38 39#include <sys/param.h> 40#include <sys/fcntl.h> 41#include <sys/lockf.h> 42#include <sys/lock.h> 43#include <sys/namei.h> 44#include <sys/priv.h> 45#include <sys/proc.h> 46#include <sys/rwlock.h> 47#include <sys/sched.h> 48#include <sys/sf_buf.h> 49#include <sys/stat.h> 50#include <sys/systm.h> 51#include <sys/sysctl.h> 52#include <sys/unistd.h> 53#include <sys/vnode.h> 54 55#include <vm/vm.h> 56#include <vm/vm_param.h> 57#include <vm/vm_object.h> 58#include <vm/vm_page.h> 59#include <vm/vm_pager.h> 60 61#include <fs/tmpfs/tmpfs_vnops.h> 62#include <fs/tmpfs/tmpfs.h> 63 64SYSCTL_DECL(_vfs_tmpfs); 65 66static volatile int tmpfs_rename_restarts; 67SYSCTL_INT(_vfs_tmpfs, OID_AUTO, rename_restarts, CTLFLAG_RD, 68 __DEVOLATILE(int *, &tmpfs_rename_restarts), 0, 69 "Times rename had to restart due to lock contention"); 70 71static int 72tmpfs_vn_get_ino_alloc(struct mount *mp, void *arg, int lkflags, 73 struct vnode **rvp) 74{ 75 76 return (tmpfs_alloc_vp(mp, arg, lkflags, rvp)); 77} 78 79static int 80tmpfs_lookup(struct vop_cachedlookup_args *v) 81{ 82 struct vnode *dvp = v->a_dvp; 83 struct vnode **vpp = v->a_vpp; 84 struct componentname *cnp = v->a_cnp; 85 struct tmpfs_dirent *de; 86 struct tmpfs_node *dnode; 87 int error; 88 89 dnode = VP_TO_TMPFS_DIR(dvp); 90 *vpp = NULLVP; 91 92 /* Check accessibility of requested node as a first step. */ 93 error = VOP_ACCESS(dvp, VEXEC, cnp->cn_cred, cnp->cn_thread); 94 if (error != 0) 95 goto out; 96 97 /* We cannot be requesting the parent directory of the root node. */ 98 MPASS(IMPLIES(dnode->tn_type == VDIR && 99 dnode->tn_dir.tn_parent == dnode, 100 !(cnp->cn_flags & ISDOTDOT))); 101 102 TMPFS_ASSERT_LOCKED(dnode); 103 if (dnode->tn_dir.tn_parent == NULL) { 104 error = ENOENT; 105 goto out; 106 } 107 if (cnp->cn_flags & ISDOTDOT) { 108 error = vn_vget_ino_gen(dvp, tmpfs_vn_get_ino_alloc, 109 dnode->tn_dir.tn_parent, cnp->cn_lkflags, vpp); 110 if (error != 0) 111 goto out; 112 } else if (cnp->cn_namelen == 1 && cnp->cn_nameptr[0] == '.') { 113 VREF(dvp); 114 *vpp = dvp; 115 error = 0; 116 } else { 117 de = tmpfs_dir_lookup(dnode, NULL, cnp); 118 if (de != NULL && de->td_node == NULL) 119 cnp->cn_flags |= ISWHITEOUT; 120 if (de == NULL || de->td_node == NULL) { 121 /* The entry was not found in the directory. 122 * This is OK if we are creating or renaming an 123 * entry and are working on the last component of 124 * the path name. */ 125 if ((cnp->cn_flags & ISLASTCN) && 126 (cnp->cn_nameiop == CREATE || \ 127 cnp->cn_nameiop == RENAME || 128 (cnp->cn_nameiop == DELETE && 129 cnp->cn_flags & DOWHITEOUT && 130 cnp->cn_flags & ISWHITEOUT))) { 131 error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred, 132 cnp->cn_thread); 133 if (error != 0) 134 goto out; 135 136 /* Keep the component name in the buffer for 137 * future uses. */ 138 cnp->cn_flags |= SAVENAME; 139 140 error = EJUSTRETURN; 141 } else 142 error = ENOENT; 143 } else { 144 struct tmpfs_node *tnode; 145 146 /* The entry was found, so get its associated 147 * tmpfs_node. */ 148 tnode = de->td_node; 149 150 /* If we are not at the last path component and 151 * found a non-directory or non-link entry (which 152 * may itself be pointing to a directory), raise 153 * an error. */ 154 if ((tnode->tn_type != VDIR && 155 tnode->tn_type != VLNK) && 156 !(cnp->cn_flags & ISLASTCN)) { 157 error = ENOTDIR; 158 goto out; 159 } 160 161 /* If we are deleting or renaming the entry, keep 162 * track of its tmpfs_dirent so that it can be 163 * easily deleted later. */ 164 if ((cnp->cn_flags & ISLASTCN) && 165 (cnp->cn_nameiop == DELETE || 166 cnp->cn_nameiop == RENAME)) { 167 error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred, 168 cnp->cn_thread); 169 if (error != 0) 170 goto out; 171 172 /* Allocate a new vnode on the matching entry. */ 173 error = tmpfs_alloc_vp(dvp->v_mount, tnode, 174 cnp->cn_lkflags, vpp); 175 if (error != 0) 176 goto out; 177 178 if ((dnode->tn_mode & S_ISTXT) && 179 VOP_ACCESS(dvp, VADMIN, cnp->cn_cred, cnp->cn_thread) && 180 VOP_ACCESS(*vpp, VADMIN, cnp->cn_cred, cnp->cn_thread)) { 181 error = EPERM; 182 vput(*vpp); 183 *vpp = NULL; 184 goto out; 185 } 186 cnp->cn_flags |= SAVENAME; 187 } else { 188 error = tmpfs_alloc_vp(dvp->v_mount, tnode, 189 cnp->cn_lkflags, vpp); 190 if (error != 0) 191 goto out; 192 } 193 } 194 } 195 196 /* Store the result of this lookup in the cache. Avoid this if the 197 * request was for creation, as it does not improve timings on 198 * emprical tests. */ 199 if ((cnp->cn_flags & MAKEENTRY) && cnp->cn_nameiop != CREATE) 200 cache_enter(dvp, *vpp, cnp); 201 202out: 203 /* If there were no errors, *vpp cannot be null and it must be 204 * locked. */ 205 MPASS(IFF(error == 0, *vpp != NULLVP && VOP_ISLOCKED(*vpp))); 206 207 return error; 208} 209 210static int 211tmpfs_create(struct vop_create_args *v) 212{ 213 struct vnode *dvp = v->a_dvp; 214 struct vnode **vpp = v->a_vpp; 215 struct componentname *cnp = v->a_cnp; 216 struct vattr *vap = v->a_vap; 217 218 MPASS(vap->va_type == VREG || vap->va_type == VSOCK); 219 220 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 221} 222 223static int 224tmpfs_mknod(struct vop_mknod_args *v) 225{ 226 struct vnode *dvp = v->a_dvp; 227 struct vnode **vpp = v->a_vpp; 228 struct componentname *cnp = v->a_cnp; 229 struct vattr *vap = v->a_vap; 230 231 if (vap->va_type != VBLK && vap->va_type != VCHR && 232 vap->va_type != VFIFO) 233 return EINVAL; 234 235 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 236} 237 238static int 239tmpfs_open(struct vop_open_args *v) 240{ 241 struct vnode *vp = v->a_vp; 242 int mode = v->a_mode; 243 244 int error; 245 struct tmpfs_node *node; 246 247 MPASS(VOP_ISLOCKED(vp)); 248 249 node = VP_TO_TMPFS_NODE(vp); 250 251 /* The file is still active but all its names have been removed 252 * (e.g. by a "rmdir $(pwd)"). It cannot be opened any more as 253 * it is about to die. */ 254 if (node->tn_links < 1) 255 return (ENOENT); 256 257 /* If the file is marked append-only, deny write requests. */ 258 if (node->tn_flags & APPEND && (mode & (FWRITE | O_APPEND)) == FWRITE) 259 error = EPERM; 260 else { 261 error = 0; 262 /* For regular files, the call below is nop. */ 263 KASSERT(vp->v_type != VREG || (node->tn_reg.tn_aobj->flags & 264 OBJ_DEAD) == 0, ("dead object")); 265 vnode_create_vobject(vp, node->tn_size, v->a_td); 266 } 267 268 MPASS(VOP_ISLOCKED(vp)); 269 return error; 270} 271 272static int 273tmpfs_close(struct vop_close_args *v) 274{ 275 struct vnode *vp = v->a_vp; 276 277 /* Update node times. */ 278 tmpfs_update(vp); 279 280 return (0); 281} 282 283int 284tmpfs_access(struct vop_access_args *v) 285{ 286 struct vnode *vp = v->a_vp; 287 accmode_t accmode = v->a_accmode; 288 struct ucred *cred = v->a_cred; 289 290 int error; 291 struct tmpfs_node *node; 292 293 MPASS(VOP_ISLOCKED(vp)); 294 295 node = VP_TO_TMPFS_NODE(vp); 296 297 switch (vp->v_type) { 298 case VDIR: 299 /* FALLTHROUGH */ 300 case VLNK: 301 /* FALLTHROUGH */ 302 case VREG: 303 if (accmode & VWRITE && vp->v_mount->mnt_flag & MNT_RDONLY) { 304 error = EROFS; 305 goto out; 306 } 307 break; 308 309 case VBLK: 310 /* FALLTHROUGH */ 311 case VCHR: 312 /* FALLTHROUGH */ 313 case VSOCK: 314 /* FALLTHROUGH */ 315 case VFIFO: 316 break; 317 318 default: 319 error = EINVAL; 320 goto out; 321 } 322 323 if (accmode & VWRITE && node->tn_flags & IMMUTABLE) { 324 error = EPERM; 325 goto out; 326 } 327 328 error = vaccess(vp->v_type, node->tn_mode, node->tn_uid, 329 node->tn_gid, accmode, cred, NULL); 330 331out: 332 MPASS(VOP_ISLOCKED(vp)); 333 334 return error; 335} 336 337int 338tmpfs_getattr(struct vop_getattr_args *v) 339{ 340 struct vnode *vp = v->a_vp; 341 struct vattr *vap = v->a_vap; 342 343 struct tmpfs_node *node; 344 345 node = VP_TO_TMPFS_NODE(vp); 346 347 tmpfs_update(vp); 348 349 vap->va_type = vp->v_type; 350 vap->va_mode = node->tn_mode; 351 vap->va_nlink = node->tn_links; 352 vap->va_uid = node->tn_uid; 353 vap->va_gid = node->tn_gid; 354 vap->va_fsid = vp->v_mount->mnt_stat.f_fsid.val[0]; 355 vap->va_fileid = node->tn_id; 356 vap->va_size = node->tn_size; 357 vap->va_blocksize = PAGE_SIZE; 358 vap->va_atime = node->tn_atime; 359 vap->va_mtime = node->tn_mtime; 360 vap->va_ctime = node->tn_ctime; 361 vap->va_birthtime = node->tn_birthtime; 362 vap->va_gen = node->tn_gen; 363 vap->va_flags = node->tn_flags; 364 vap->va_rdev = (vp->v_type == VBLK || vp->v_type == VCHR) ? 365 node->tn_rdev : NODEV; 366 vap->va_bytes = round_page(node->tn_size); 367 vap->va_filerev = 0; 368 369 return 0; 370} 371 372int 373tmpfs_setattr(struct vop_setattr_args *v) 374{ 375 struct vnode *vp = v->a_vp; 376 struct vattr *vap = v->a_vap; 377 struct ucred *cred = v->a_cred; 378 struct thread *td = curthread; 379 380 int error; 381 382 MPASS(VOP_ISLOCKED(vp)); 383 384 error = 0; 385 386 /* Abort if any unsettable attribute is given. */ 387 if (vap->va_type != VNON || 388 vap->va_nlink != VNOVAL || 389 vap->va_fsid != VNOVAL || 390 vap->va_fileid != VNOVAL || 391 vap->va_blocksize != VNOVAL || 392 vap->va_gen != VNOVAL || 393 vap->va_rdev != VNOVAL || 394 vap->va_bytes != VNOVAL) 395 error = EINVAL; 396 397 if (error == 0 && (vap->va_flags != VNOVAL)) 398 error = tmpfs_chflags(vp, vap->va_flags, cred, td); 399 400 if (error == 0 && (vap->va_size != VNOVAL)) 401 error = tmpfs_chsize(vp, vap->va_size, cred, td); 402 403 if (error == 0 && (vap->va_uid != VNOVAL || vap->va_gid != VNOVAL)) 404 error = tmpfs_chown(vp, vap->va_uid, vap->va_gid, cred, td); 405 406 if (error == 0 && (vap->va_mode != (mode_t)VNOVAL)) 407 error = tmpfs_chmod(vp, vap->va_mode, cred, td); 408 409 if (error == 0 && ((vap->va_atime.tv_sec != VNOVAL && 410 vap->va_atime.tv_nsec != VNOVAL) || 411 (vap->va_mtime.tv_sec != VNOVAL && 412 vap->va_mtime.tv_nsec != VNOVAL) || 413 (vap->va_birthtime.tv_sec != VNOVAL && 414 vap->va_birthtime.tv_nsec != VNOVAL))) 415 error = tmpfs_chtimes(vp, vap, cred, td); 416 417 /* Update the node times. We give preference to the error codes 418 * generated by this function rather than the ones that may arise 419 * from tmpfs_update. */ 420 tmpfs_update(vp); 421 422 MPASS(VOP_ISLOCKED(vp)); 423 424 return error; 425} 426 427static int 428tmpfs_read(struct vop_read_args *v) 429{ 430 struct vnode *vp; 431 struct uio *uio; 432 struct tmpfs_node *node; 433 434 vp = v->a_vp; 435 if (vp->v_type != VREG) 436 return (EISDIR); 437 uio = v->a_uio; 438 if (uio->uio_offset < 0) 439 return (EINVAL); 440 node = VP_TO_TMPFS_NODE(vp); 441 node->tn_status |= TMPFS_NODE_ACCESSED; 442 return (uiomove_object(node->tn_reg.tn_aobj, node->tn_size, uio)); 443} 444 445static int 446tmpfs_write(struct vop_write_args *v) 447{ 448 struct vnode *vp; 449 struct uio *uio; 450 struct tmpfs_node *node; 451 off_t oldsize; 452 int error, ioflag; 453 boolean_t extended; 454 455 vp = v->a_vp; 456 uio = v->a_uio; 457 ioflag = v->a_ioflag; 458 error = 0; 459 node = VP_TO_TMPFS_NODE(vp); 460 oldsize = node->tn_size; 461 462 if (uio->uio_offset < 0 || vp->v_type != VREG) 463 return (EINVAL); 464 if (uio->uio_resid == 0) 465 return (0); 466 if (ioflag & IO_APPEND) 467 uio->uio_offset = node->tn_size; 468 if (uio->uio_offset + uio->uio_resid > 469 VFS_TO_TMPFS(vp->v_mount)->tm_maxfilesize) 470 return (EFBIG); 471 if (vn_rlimit_fsize(vp, uio, uio->uio_td)) 472 return (EFBIG); 473 extended = uio->uio_offset + uio->uio_resid > node->tn_size; 474 if (extended) { 475 error = tmpfs_reg_resize(vp, uio->uio_offset + uio->uio_resid, 476 FALSE); 477 if (error != 0) 478 goto out; 479 } 480 481 error = uiomove_object(node->tn_reg.tn_aobj, node->tn_size, uio); 482 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_MODIFIED | 483 (extended ? TMPFS_NODE_CHANGED : 0); 484 if (node->tn_mode & (S_ISUID | S_ISGID)) { 485 if (priv_check_cred(v->a_cred, PRIV_VFS_RETAINSUGID, 0)) 486 node->tn_mode &= ~(S_ISUID | S_ISGID); 487 } 488 if (error != 0) 489 (void)tmpfs_reg_resize(vp, oldsize, TRUE); 490 491out: 492 MPASS(IMPLIES(error == 0, uio->uio_resid == 0)); 493 MPASS(IMPLIES(error != 0, oldsize == node->tn_size)); 494 495 return (error); 496} 497 498static int 499tmpfs_fsync(struct vop_fsync_args *v) 500{ 501 struct vnode *vp = v->a_vp; 502 503 MPASS(VOP_ISLOCKED(vp)); 504 505 tmpfs_update(vp); 506 507 return 0; 508} 509 510static int 511tmpfs_remove(struct vop_remove_args *v) 512{ 513 struct vnode *dvp = v->a_dvp; 514 struct vnode *vp = v->a_vp; 515 516 int error; 517 struct tmpfs_dirent *de; 518 struct tmpfs_mount *tmp; 519 struct tmpfs_node *dnode; 520 struct tmpfs_node *node; 521 522 MPASS(VOP_ISLOCKED(dvp)); 523 MPASS(VOP_ISLOCKED(vp)); 524 525 if (vp->v_type == VDIR) { 526 error = EISDIR; 527 goto out; 528 } 529 530 dnode = VP_TO_TMPFS_DIR(dvp); 531 node = VP_TO_TMPFS_NODE(vp); 532 tmp = VFS_TO_TMPFS(vp->v_mount); 533 de = tmpfs_dir_lookup(dnode, node, v->a_cnp); 534 MPASS(de != NULL); 535 536 /* Files marked as immutable or append-only cannot be deleted. */ 537 if ((node->tn_flags & (IMMUTABLE | APPEND | NOUNLINK)) || 538 (dnode->tn_flags & APPEND)) { 539 error = EPERM; 540 goto out; 541 } 542 543 /* Remove the entry from the directory; as it is a file, we do not 544 * have to change the number of hard links of the directory. */ 545 tmpfs_dir_detach(dvp, de); 546 if (v->a_cnp->cn_flags & DOWHITEOUT) 547 tmpfs_dir_whiteout_add(dvp, v->a_cnp); 548 549 /* Free the directory entry we just deleted. Note that the node 550 * referred by it will not be removed until the vnode is really 551 * reclaimed. */ 552 tmpfs_free_dirent(tmp, de); 553 554 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED; 555 error = 0; 556 557out: 558 559 return error; 560} 561 562static int 563tmpfs_link(struct vop_link_args *v) 564{ 565 struct vnode *dvp = v->a_tdvp; 566 struct vnode *vp = v->a_vp; 567 struct componentname *cnp = v->a_cnp; 568 569 int error; 570 struct tmpfs_dirent *de; 571 struct tmpfs_node *node; 572 573 MPASS(VOP_ISLOCKED(dvp)); 574 MPASS(cnp->cn_flags & HASBUF); 575 MPASS(dvp != vp); /* XXX When can this be false? */ 576 node = VP_TO_TMPFS_NODE(vp); 577 578 /* Ensure that we do not overflow the maximum number of links imposed 579 * by the system. */ 580 MPASS(node->tn_links <= LINK_MAX); 581 if (node->tn_links == LINK_MAX) { 582 error = EMLINK; 583 goto out; 584 } 585 586 /* We cannot create links of files marked immutable or append-only. */ 587 if (node->tn_flags & (IMMUTABLE | APPEND)) { 588 error = EPERM; 589 goto out; 590 } 591 592 /* Allocate a new directory entry to represent the node. */ 593 error = tmpfs_alloc_dirent(VFS_TO_TMPFS(vp->v_mount), node, 594 cnp->cn_nameptr, cnp->cn_namelen, &de); 595 if (error != 0) 596 goto out; 597 598 /* Insert the new directory entry into the appropriate directory. */ 599 if (cnp->cn_flags & ISWHITEOUT) 600 tmpfs_dir_whiteout_remove(dvp, cnp); 601 tmpfs_dir_attach(dvp, de); 602 603 /* vp link count has changed, so update node times. */ 604 node->tn_status |= TMPFS_NODE_CHANGED; 605 tmpfs_update(vp); 606 607 error = 0; 608 609out: 610 return error; 611} 612 613/* 614 * We acquire all but fdvp locks using non-blocking acquisitions. If we 615 * fail to acquire any lock in the path we will drop all held locks, 616 * acquire the new lock in a blocking fashion, and then release it and 617 * restart the rename. This acquire/release step ensures that we do not 618 * spin on a lock waiting for release. On error release all vnode locks 619 * and decrement references the way tmpfs_rename() would do. 620 */ 621static int 622tmpfs_rename_relock(struct vnode *fdvp, struct vnode **fvpp, 623 struct vnode *tdvp, struct vnode **tvpp, 624 struct componentname *fcnp, struct componentname *tcnp) 625{ 626 struct vnode *nvp; 627 struct mount *mp; 628 struct tmpfs_dirent *de; 629 int error, restarts = 0; 630 631 VOP_UNLOCK(tdvp, 0); 632 if (*tvpp != NULL && *tvpp != tdvp) 633 VOP_UNLOCK(*tvpp, 0); 634 mp = fdvp->v_mount; 635 636relock: 637 restarts += 1; 638 error = vn_lock(fdvp, LK_EXCLUSIVE); 639 if (error) 640 goto releout; 641 if (vn_lock(tdvp, LK_EXCLUSIVE | LK_NOWAIT) != 0) { 642 VOP_UNLOCK(fdvp, 0); 643 error = vn_lock(tdvp, LK_EXCLUSIVE); 644 if (error) 645 goto releout; 646 VOP_UNLOCK(tdvp, 0); 647 goto relock; 648 } 649 /* 650 * Re-resolve fvp to be certain it still exists and fetch the 651 * correct vnode. 652 */ 653 de = tmpfs_dir_lookup(VP_TO_TMPFS_DIR(fdvp), NULL, fcnp); 654 if (de == NULL) { 655 VOP_UNLOCK(fdvp, 0); 656 VOP_UNLOCK(tdvp, 0); 657 if ((fcnp->cn_flags & ISDOTDOT) != 0 || 658 (fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.')) 659 error = EINVAL; 660 else 661 error = ENOENT; 662 goto releout; 663 } 664 error = tmpfs_alloc_vp(mp, de->td_node, LK_EXCLUSIVE | LK_NOWAIT, &nvp); 665 if (error != 0) { 666 VOP_UNLOCK(fdvp, 0); 667 VOP_UNLOCK(tdvp, 0); 668 if (error != EBUSY) 669 goto releout; 670 error = tmpfs_alloc_vp(mp, de->td_node, LK_EXCLUSIVE, &nvp); 671 if (error != 0) 672 goto releout; 673 VOP_UNLOCK(nvp, 0); 674 /* 675 * Concurrent rename race. 676 */ 677 if (nvp == tdvp) { 678 vrele(nvp); 679 error = EINVAL; 680 goto releout; 681 } 682 vrele(*fvpp); 683 *fvpp = nvp; 684 goto relock; 685 } 686 vrele(*fvpp); 687 *fvpp = nvp; 688 VOP_UNLOCK(*fvpp, 0); 689 /* 690 * Re-resolve tvp and acquire the vnode lock if present. 691 */ 692 de = tmpfs_dir_lookup(VP_TO_TMPFS_DIR(tdvp), NULL, tcnp); 693 /* 694 * If tvp disappeared we just carry on. 695 */ 696 if (de == NULL && *tvpp != NULL) { 697 vrele(*tvpp); 698 *tvpp = NULL; 699 } 700 /* 701 * Get the tvp ino if the lookup succeeded. We may have to restart 702 * if the non-blocking acquire fails. 703 */ 704 if (de != NULL) { 705 nvp = NULL; 706 error = tmpfs_alloc_vp(mp, de->td_node, 707 LK_EXCLUSIVE | LK_NOWAIT, &nvp); 708 if (*tvpp != NULL) 709 vrele(*tvpp); 710 *tvpp = nvp; 711 if (error != 0) { 712 VOP_UNLOCK(fdvp, 0); 713 VOP_UNLOCK(tdvp, 0); 714 if (error != EBUSY) 715 goto releout; 716 error = tmpfs_alloc_vp(mp, de->td_node, LK_EXCLUSIVE, 717 &nvp); 718 if (error != 0) 719 goto releout; 720 VOP_UNLOCK(nvp, 0); 721 /* 722 * fdvp contains fvp, thus tvp (=fdvp) is not empty. 723 */ 724 if (nvp == fdvp) { 725 error = ENOTEMPTY; 726 goto releout; 727 } 728 goto relock; 729 } 730 } 731 tmpfs_rename_restarts += restarts; 732 733 return (0); 734 735releout: 736 vrele(fdvp); 737 vrele(*fvpp); 738 vrele(tdvp); 739 if (*tvpp != NULL) 740 vrele(*tvpp); 741 tmpfs_rename_restarts += restarts; 742 743 return (error); 744} 745 746static int 747tmpfs_rename(struct vop_rename_args *v) 748{ 749 struct vnode *fdvp = v->a_fdvp; 750 struct vnode *fvp = v->a_fvp; 751 struct componentname *fcnp = v->a_fcnp; 752 struct vnode *tdvp = v->a_tdvp; 753 struct vnode *tvp = v->a_tvp; 754 struct componentname *tcnp = v->a_tcnp; 755 struct mount *mp = NULL; 756 757 char *newname; 758 int error; 759 struct tmpfs_dirent *de; 760 struct tmpfs_mount *tmp; 761 struct tmpfs_node *fdnode; 762 struct tmpfs_node *fnode; 763 struct tmpfs_node *tnode; 764 struct tmpfs_node *tdnode; 765 766 MPASS(VOP_ISLOCKED(tdvp)); 767 MPASS(IMPLIES(tvp != NULL, VOP_ISLOCKED(tvp))); 768 MPASS(fcnp->cn_flags & HASBUF); 769 MPASS(tcnp->cn_flags & HASBUF); 770 771 /* Disallow cross-device renames. 772 * XXX Why isn't this done by the caller? */ 773 if (fvp->v_mount != tdvp->v_mount || 774 (tvp != NULL && fvp->v_mount != tvp->v_mount)) { 775 error = EXDEV; 776 goto out; 777 } 778 779 /* If source and target are the same file, there is nothing to do. */ 780 if (fvp == tvp) { 781 error = 0; 782 goto out; 783 } 784 785 /* If we need to move the directory between entries, lock the 786 * source so that we can safely operate on it. */ 787 if (fdvp != tdvp && fdvp != tvp) { 788 if (vn_lock(fdvp, LK_EXCLUSIVE | LK_NOWAIT) != 0) { 789 mp = tdvp->v_mount; 790 error = vfs_busy(mp, 0); 791 if (error != 0) { 792 mp = NULL; 793 goto out; 794 } 795 error = tmpfs_rename_relock(fdvp, &fvp, tdvp, &tvp, 796 fcnp, tcnp); 797 if (error != 0) { 798 vfs_unbusy(mp); 799 return (error); 800 } 801 ASSERT_VOP_ELOCKED(fdvp, 802 "tmpfs_rename: fdvp not locked"); 803 ASSERT_VOP_ELOCKED(tdvp, 804 "tmpfs_rename: tdvp not locked"); 805 if (tvp != NULL) 806 ASSERT_VOP_ELOCKED(tvp, 807 "tmpfs_rename: tvp not locked"); 808 if (fvp == tvp) { 809 error = 0; 810 goto out_locked; 811 } 812 } 813 } 814 815 tmp = VFS_TO_TMPFS(tdvp->v_mount); 816 tdnode = VP_TO_TMPFS_DIR(tdvp); 817 tnode = (tvp == NULL) ? NULL : VP_TO_TMPFS_NODE(tvp); 818 fdnode = VP_TO_TMPFS_DIR(fdvp); 819 fnode = VP_TO_TMPFS_NODE(fvp); 820 de = tmpfs_dir_lookup(fdnode, fnode, fcnp); 821 822 /* Entry can disappear before we lock fdvp, 823 * also avoid manipulating '.' and '..' entries. */ 824 if (de == NULL) { 825 if ((fcnp->cn_flags & ISDOTDOT) != 0 || 826 (fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.')) 827 error = EINVAL; 828 else 829 error = ENOENT; 830 goto out_locked; 831 } 832 MPASS(de->td_node == fnode); 833 834 /* If re-naming a directory to another preexisting directory 835 * ensure that the target directory is empty so that its 836 * removal causes no side effects. 837 * Kern_rename gurantees the destination to be a directory 838 * if the source is one. */ 839 if (tvp != NULL) { 840 MPASS(tnode != NULL); 841 842 if ((tnode->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) || 843 (tdnode->tn_flags & (APPEND | IMMUTABLE))) { 844 error = EPERM; 845 goto out_locked; 846 } 847 848 if (fnode->tn_type == VDIR && tnode->tn_type == VDIR) { 849 if (tnode->tn_size > 0) { 850 error = ENOTEMPTY; 851 goto out_locked; 852 } 853 } else if (fnode->tn_type == VDIR && tnode->tn_type != VDIR) { 854 error = ENOTDIR; 855 goto out_locked; 856 } else if (fnode->tn_type != VDIR && tnode->tn_type == VDIR) { 857 error = EISDIR; 858 goto out_locked; 859 } else { 860 MPASS(fnode->tn_type != VDIR && 861 tnode->tn_type != VDIR); 862 } 863 } 864 865 if ((fnode->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) 866 || (fdnode->tn_flags & (APPEND | IMMUTABLE))) { 867 error = EPERM; 868 goto out_locked; 869 } 870 871 /* Ensure that we have enough memory to hold the new name, if it 872 * has to be changed. */ 873 if (fcnp->cn_namelen != tcnp->cn_namelen || 874 bcmp(fcnp->cn_nameptr, tcnp->cn_nameptr, fcnp->cn_namelen) != 0) { 875 newname = malloc(tcnp->cn_namelen, M_TMPFSNAME, M_WAITOK); 876 } else 877 newname = NULL; 878 879 /* If the node is being moved to another directory, we have to do 880 * the move. */ 881 if (fdnode != tdnode) { 882 /* In case we are moving a directory, we have to adjust its 883 * parent to point to the new parent. */ 884 if (de->td_node->tn_type == VDIR) { 885 struct tmpfs_node *n; 886 887 /* Ensure the target directory is not a child of the 888 * directory being moved. Otherwise, we'd end up 889 * with stale nodes. */ 890 n = tdnode; 891 /* TMPFS_LOCK garanties that no nodes are freed while 892 * traversing the list. Nodes can only be marked as 893 * removed: tn_parent == NULL. */ 894 TMPFS_LOCK(tmp); 895 TMPFS_NODE_LOCK(n); 896 while (n != n->tn_dir.tn_parent) { 897 struct tmpfs_node *parent; 898 899 if (n == fnode) { 900 TMPFS_NODE_UNLOCK(n); 901 TMPFS_UNLOCK(tmp); 902 error = EINVAL; 903 if (newname != NULL) 904 free(newname, M_TMPFSNAME); 905 goto out_locked; 906 } 907 parent = n->tn_dir.tn_parent; 908 TMPFS_NODE_UNLOCK(n); 909 if (parent == NULL) { 910 n = NULL; 911 break; 912 } 913 TMPFS_NODE_LOCK(parent); 914 if (parent->tn_dir.tn_parent == NULL) { 915 TMPFS_NODE_UNLOCK(parent); 916 n = NULL; 917 break; 918 } 919 n = parent; 920 } 921 TMPFS_UNLOCK(tmp); 922 if (n == NULL) { 923 error = EINVAL; 924 if (newname != NULL) 925 free(newname, M_TMPFSNAME); 926 goto out_locked; 927 } 928 TMPFS_NODE_UNLOCK(n); 929 930 /* Adjust the parent pointer. */ 931 TMPFS_VALIDATE_DIR(fnode); 932 TMPFS_NODE_LOCK(de->td_node); 933 de->td_node->tn_dir.tn_parent = tdnode; 934 TMPFS_NODE_UNLOCK(de->td_node); 935 936 /* As a result of changing the target of the '..' 937 * entry, the link count of the source and target 938 * directories has to be adjusted. */ 939 TMPFS_NODE_LOCK(tdnode); 940 TMPFS_ASSERT_LOCKED(tdnode); 941 tdnode->tn_links++; 942 TMPFS_NODE_UNLOCK(tdnode); 943 944 TMPFS_NODE_LOCK(fdnode); 945 TMPFS_ASSERT_LOCKED(fdnode); 946 fdnode->tn_links--; 947 TMPFS_NODE_UNLOCK(fdnode); 948 } 949 } 950 951 /* Do the move: just remove the entry from the source directory 952 * and insert it into the target one. */ 953 tmpfs_dir_detach(fdvp, de); 954 955 if (fcnp->cn_flags & DOWHITEOUT) 956 tmpfs_dir_whiteout_add(fdvp, fcnp); 957 if (tcnp->cn_flags & ISWHITEOUT) 958 tmpfs_dir_whiteout_remove(tdvp, tcnp); 959 960 /* If the name has changed, we need to make it effective by changing 961 * it in the directory entry. */ 962 if (newname != NULL) { 963 MPASS(tcnp->cn_namelen <= MAXNAMLEN); 964 965 free(de->ud.td_name, M_TMPFSNAME); 966 de->ud.td_name = newname; 967 tmpfs_dirent_init(de, tcnp->cn_nameptr, tcnp->cn_namelen); 968 969 fnode->tn_status |= TMPFS_NODE_CHANGED; 970 tdnode->tn_status |= TMPFS_NODE_MODIFIED; 971 } 972 973 /* If we are overwriting an entry, we have to remove the old one 974 * from the target directory. */ 975 if (tvp != NULL) { 976 struct tmpfs_dirent *tde; 977 978 /* Remove the old entry from the target directory. */ 979 tde = tmpfs_dir_lookup(tdnode, tnode, tcnp); 980 tmpfs_dir_detach(tdvp, tde); 981 982 /* Free the directory entry we just deleted. Note that the 983 * node referred by it will not be removed until the vnode is 984 * really reclaimed. */ 985 tmpfs_free_dirent(VFS_TO_TMPFS(tvp->v_mount), tde); 986 } 987 988 tmpfs_dir_attach(tdvp, de); 989 990 cache_purge(fvp); 991 if (tvp != NULL) 992 cache_purge(tvp); 993 cache_purge_negative(tdvp); 994 995 error = 0; 996 997out_locked: 998 if (fdvp != tdvp && fdvp != tvp) 999 VOP_UNLOCK(fdvp, 0); 1000 1001out: 1002 /* Release target nodes. */ 1003 /* XXX: I don't understand when tdvp can be the same as tvp, but 1004 * other code takes care of this... */ 1005 if (tdvp == tvp) 1006 vrele(tdvp); 1007 else 1008 vput(tdvp); 1009 if (tvp != NULL) 1010 vput(tvp); 1011 1012 /* Release source nodes. */ 1013 vrele(fdvp); 1014 vrele(fvp); 1015 1016 if (mp != NULL) 1017 vfs_unbusy(mp); 1018 1019 return error; 1020} 1021 1022static int 1023tmpfs_mkdir(struct vop_mkdir_args *v) 1024{ 1025 struct vnode *dvp = v->a_dvp; 1026 struct vnode **vpp = v->a_vpp; 1027 struct componentname *cnp = v->a_cnp; 1028 struct vattr *vap = v->a_vap; 1029 1030 MPASS(vap->va_type == VDIR); 1031 1032 return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL); 1033} 1034 1035static int 1036tmpfs_rmdir(struct vop_rmdir_args *v) 1037{ 1038 struct vnode *dvp = v->a_dvp; 1039 struct vnode *vp = v->a_vp; 1040 1041 int error; 1042 struct tmpfs_dirent *de; 1043 struct tmpfs_mount *tmp; 1044 struct tmpfs_node *dnode; 1045 struct tmpfs_node *node; 1046 1047 MPASS(VOP_ISLOCKED(dvp)); 1048 MPASS(VOP_ISLOCKED(vp)); 1049 1050 tmp = VFS_TO_TMPFS(dvp->v_mount); 1051 dnode = VP_TO_TMPFS_DIR(dvp); 1052 node = VP_TO_TMPFS_DIR(vp); 1053 1054 /* Directories with more than two entries ('.' and '..') cannot be 1055 * removed. */ 1056 if (node->tn_size > 0) { 1057 error = ENOTEMPTY; 1058 goto out; 1059 } 1060 1061 if ((dnode->tn_flags & APPEND) 1062 || (node->tn_flags & (NOUNLINK | IMMUTABLE | APPEND))) { 1063 error = EPERM; 1064 goto out; 1065 } 1066 1067 /* This invariant holds only if we are not trying to remove "..". 1068 * We checked for that above so this is safe now. */ 1069 MPASS(node->tn_dir.tn_parent == dnode); 1070 1071 /* Get the directory entry associated with node (vp). This was 1072 * filled by tmpfs_lookup while looking up the entry. */ 1073 de = tmpfs_dir_lookup(dnode, node, v->a_cnp); 1074 MPASS(TMPFS_DIRENT_MATCHES(de, 1075 v->a_cnp->cn_nameptr, 1076 v->a_cnp->cn_namelen)); 1077 1078 /* Check flags to see if we are allowed to remove the directory. */ 1079 if (dnode->tn_flags & APPEND 1080 || node->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) { 1081 error = EPERM; 1082 goto out; 1083 } 1084 1085 1086 /* Detach the directory entry from the directory (dnode). */ 1087 tmpfs_dir_detach(dvp, de); 1088 if (v->a_cnp->cn_flags & DOWHITEOUT) 1089 tmpfs_dir_whiteout_add(dvp, v->a_cnp); 1090 1091 /* No vnode should be allocated for this entry from this point */ 1092 TMPFS_NODE_LOCK(node); 1093 TMPFS_ASSERT_ELOCKED(node); 1094 node->tn_links--; 1095 node->tn_dir.tn_parent = NULL; 1096 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED | \ 1097 TMPFS_NODE_MODIFIED; 1098 1099 TMPFS_NODE_UNLOCK(node); 1100 1101 TMPFS_NODE_LOCK(dnode); 1102 TMPFS_ASSERT_ELOCKED(dnode); 1103 dnode->tn_links--; 1104 dnode->tn_status |= TMPFS_NODE_ACCESSED | \ 1105 TMPFS_NODE_CHANGED | TMPFS_NODE_MODIFIED; 1106 TMPFS_NODE_UNLOCK(dnode); 1107 1108 cache_purge(dvp); 1109 cache_purge(vp); 1110 1111 /* Free the directory entry we just deleted. Note that the node 1112 * referred by it will not be removed until the vnode is really 1113 * reclaimed. */ 1114 tmpfs_free_dirent(tmp, de); 1115 1116 /* Release the deleted vnode (will destroy the node, notify 1117 * interested parties and clean it from the cache). */ 1118 1119 dnode->tn_status |= TMPFS_NODE_CHANGED; 1120 tmpfs_update(dvp); 1121 1122 error = 0; 1123 1124out: 1125 return error; 1126} 1127 1128static int 1129tmpfs_symlink(struct vop_symlink_args *v) 1130{ 1131 struct vnode *dvp = v->a_dvp; 1132 struct vnode **vpp = v->a_vpp; 1133 struct componentname *cnp = v->a_cnp; 1134 struct vattr *vap = v->a_vap; 1135 char *target = v->a_target; 1136 1137#ifdef notyet /* XXX FreeBSD BUG: kern_symlink is not setting VLNK */ 1138 MPASS(vap->va_type == VLNK); 1139#else 1140 vap->va_type = VLNK; 1141#endif 1142 1143 return tmpfs_alloc_file(dvp, vpp, vap, cnp, target); 1144} 1145 1146static int 1147tmpfs_readdir(struct vop_readdir_args *v) 1148{ 1149 struct vnode *vp = v->a_vp; 1150 struct uio *uio = v->a_uio; 1151 int *eofflag = v->a_eofflag; 1152 u_long **cookies = v->a_cookies; 1153 int *ncookies = v->a_ncookies; 1154 1155 int error; 1156 ssize_t startresid; 1157 int maxcookies; 1158 struct tmpfs_node *node; 1159 1160 /* This operation only makes sense on directory nodes. */ 1161 if (vp->v_type != VDIR) 1162 return ENOTDIR; 1163 1164 maxcookies = 0; 1165 node = VP_TO_TMPFS_DIR(vp); 1166 1167 startresid = uio->uio_resid; 1168 1169 /* Allocate cookies for NFS and compat modules. */ 1170 if (cookies != NULL && ncookies != NULL) { 1171 maxcookies = howmany(node->tn_size, 1172 sizeof(struct tmpfs_dirent)) + 2; 1173 *cookies = malloc(maxcookies * sizeof(**cookies), M_TEMP, 1174 M_WAITOK); 1175 *ncookies = 0; 1176 } 1177 1178 if (cookies == NULL) 1179 error = tmpfs_dir_getdents(node, uio, 0, NULL, NULL); 1180 else 1181 error = tmpfs_dir_getdents(node, uio, maxcookies, *cookies, 1182 ncookies); 1183 1184 /* Buffer was filled without hitting EOF. */ 1185 if (error == EJUSTRETURN) 1186 error = (uio->uio_resid != startresid) ? 0 : EINVAL; 1187 1188 if (error != 0 && cookies != NULL) 1189 free(*cookies, M_TEMP); 1190 1191 if (eofflag != NULL) 1192 *eofflag = 1193 (error == 0 && uio->uio_offset == TMPFS_DIRCOOKIE_EOF); 1194 1195 return error; 1196} 1197 1198static int 1199tmpfs_readlink(struct vop_readlink_args *v) 1200{ 1201 struct vnode *vp = v->a_vp; 1202 struct uio *uio = v->a_uio; 1203 1204 int error; 1205 struct tmpfs_node *node; 1206 1207 MPASS(uio->uio_offset == 0); 1208 MPASS(vp->v_type == VLNK); 1209 1210 node = VP_TO_TMPFS_NODE(vp); 1211 1212 error = uiomove(node->tn_link, MIN(node->tn_size, uio->uio_resid), 1213 uio); 1214 node->tn_status |= TMPFS_NODE_ACCESSED; 1215 1216 return error; 1217} 1218 1219static int 1220tmpfs_inactive(struct vop_inactive_args *v) 1221{ 1222 struct vnode *vp = v->a_vp; 1223 1224 struct tmpfs_node *node; 1225 1226 node = VP_TO_TMPFS_NODE(vp); 1227 1228 if (node->tn_links == 0) 1229 vrecycle(vp); 1230 1231 return 0; 1232} 1233 1234int 1235tmpfs_reclaim(struct vop_reclaim_args *v) 1236{ 1237 struct vnode *vp = v->a_vp; 1238 1239 struct tmpfs_mount *tmp; 1240 struct tmpfs_node *node; 1241 1242 node = VP_TO_TMPFS_NODE(vp); 1243 tmp = VFS_TO_TMPFS(vp->v_mount); 1244 1245 if (vp->v_type == VREG) 1246 tmpfs_destroy_vobject(vp, node->tn_reg.tn_aobj); 1247 else 1248 vnode_destroy_vobject(vp); 1249 vp->v_object = NULL; 1250 cache_purge(vp); 1251 1252 TMPFS_NODE_LOCK(node); 1253 TMPFS_ASSERT_ELOCKED(node); 1254 tmpfs_free_vp(vp); 1255 1256 /* If the node referenced by this vnode was deleted by the user, 1257 * we must free its associated data structures (now that the vnode 1258 * is being reclaimed). */ 1259 if (node->tn_links == 0 && 1260 (node->tn_vpstate & TMPFS_VNODE_ALLOCATING) == 0) { 1261 node->tn_vpstate = TMPFS_VNODE_DOOMED; 1262 TMPFS_NODE_UNLOCK(node); 1263 tmpfs_free_node(tmp, node); 1264 } else 1265 TMPFS_NODE_UNLOCK(node); 1266 1267 MPASS(vp->v_data == NULL); 1268 return 0; 1269} 1270 1271static int 1272tmpfs_print(struct vop_print_args *v) 1273{ 1274 struct vnode *vp = v->a_vp; 1275 1276 struct tmpfs_node *node; 1277 1278 node = VP_TO_TMPFS_NODE(vp); 1279 1280 printf("tag VT_TMPFS, tmpfs_node %p, flags 0x%lx, links %d\n", 1281 node, node->tn_flags, node->tn_links); 1282 printf("\tmode 0%o, owner %d, group %d, size %jd, status 0x%x\n", 1283 node->tn_mode, node->tn_uid, node->tn_gid, 1284 (intmax_t)node->tn_size, node->tn_status); 1285 1286 if (vp->v_type == VFIFO) 1287 fifo_printinfo(vp); 1288 1289 printf("\n"); 1290 1291 return 0; 1292} 1293 1294static int 1295tmpfs_pathconf(struct vop_pathconf_args *v) 1296{ 1297 int name = v->a_name; 1298 register_t *retval = v->a_retval; 1299 1300 int error; 1301 1302 error = 0; 1303 1304 switch (name) { 1305 case _PC_LINK_MAX: 1306 *retval = LINK_MAX; 1307 break; 1308 1309 case _PC_NAME_MAX: 1310 *retval = NAME_MAX; 1311 break; 1312 1313 case _PC_PATH_MAX: 1314 *retval = PATH_MAX; 1315 break; 1316 1317 case _PC_PIPE_BUF: 1318 *retval = PIPE_BUF; 1319 break; 1320 1321 case _PC_CHOWN_RESTRICTED: 1322 *retval = 1; 1323 break; 1324 1325 case _PC_NO_TRUNC: 1326 *retval = 1; 1327 break; 1328 1329 case _PC_SYNC_IO: 1330 *retval = 1; 1331 break; 1332 1333 case _PC_FILESIZEBITS: 1334 *retval = 0; /* XXX Don't know which value should I return. */ 1335 break; 1336 1337 default: 1338 error = EINVAL; 1339 } 1340 1341 return error; 1342} 1343 1344static int 1345tmpfs_vptofh(struct vop_vptofh_args *ap) 1346{ 1347 struct tmpfs_fid *tfhp; 1348 struct tmpfs_node *node; 1349 1350 tfhp = (struct tmpfs_fid *)ap->a_fhp; 1351 node = VP_TO_TMPFS_NODE(ap->a_vp); 1352 1353 tfhp->tf_len = sizeof(struct tmpfs_fid); 1354 tfhp->tf_id = node->tn_id; 1355 tfhp->tf_gen = node->tn_gen; 1356 1357 return (0); 1358} 1359 1360static int 1361tmpfs_whiteout(struct vop_whiteout_args *ap) 1362{ 1363 struct vnode *dvp = ap->a_dvp; 1364 struct componentname *cnp = ap->a_cnp; 1365 struct tmpfs_dirent *de; 1366 1367 switch (ap->a_flags) { 1368 case LOOKUP: 1369 return (0); 1370 case CREATE: 1371 de = tmpfs_dir_lookup(VP_TO_TMPFS_DIR(dvp), NULL, cnp); 1372 if (de != NULL) 1373 return (de->td_node == NULL ? 0 : EEXIST); 1374 return (tmpfs_dir_whiteout_add(dvp, cnp)); 1375 case DELETE: 1376 tmpfs_dir_whiteout_remove(dvp, cnp); 1377 return (0); 1378 default: 1379 panic("tmpfs_whiteout: unknown op"); 1380 } 1381} 1382 1383/* 1384 * vnode operations vector used for files stored in a tmpfs file system. 1385 */ 1386struct vop_vector tmpfs_vnodeop_entries = { 1387 .vop_default = &default_vnodeops, 1388 .vop_lookup = vfs_cache_lookup, 1389 .vop_cachedlookup = tmpfs_lookup, 1390 .vop_create = tmpfs_create, 1391 .vop_mknod = tmpfs_mknod, 1392 .vop_open = tmpfs_open, 1393 .vop_close = tmpfs_close, 1394 .vop_access = tmpfs_access, 1395 .vop_getattr = tmpfs_getattr, 1396 .vop_setattr = tmpfs_setattr, 1397 .vop_read = tmpfs_read, 1398 .vop_write = tmpfs_write, 1399 .vop_fsync = tmpfs_fsync, 1400 .vop_remove = tmpfs_remove, 1401 .vop_link = tmpfs_link, 1402 .vop_rename = tmpfs_rename, 1403 .vop_mkdir = tmpfs_mkdir, 1404 .vop_rmdir = tmpfs_rmdir, 1405 .vop_symlink = tmpfs_symlink, 1406 .vop_readdir = tmpfs_readdir, 1407 .vop_readlink = tmpfs_readlink, 1408 .vop_inactive = tmpfs_inactive, 1409 .vop_reclaim = tmpfs_reclaim, 1410 .vop_print = tmpfs_print, 1411 .vop_pathconf = tmpfs_pathconf, 1412 .vop_vptofh = tmpfs_vptofh, 1413 .vop_whiteout = tmpfs_whiteout, 1414 .vop_bmap = VOP_EOPNOTSUPP, 1415}; 1416 1417